diff --git a/src/api/mvc/data-types/main.go b/src/api/mvc/data-types/main.go
index 9484056..dd8765a 100644
--- a/src/api/mvc/data-types/main.go
+++ b/src/api/mvc/data-types/main.go
@@ -1,6 +1,7 @@
 package dataTypes
 
 import (
+	"fmt"
 	"net/http"
 
 	"gohan/api/contexts"
@@ -20,13 +21,16 @@ var variantDataTypeJson = map[string]interface{}{
 }
 
 func GetDataTypes(c echo.Context) error {
-	es := c.(*contexts.GohanContext).Es7Client
-	cfg := c.(*contexts.GohanContext).Config
+	gc := c.(*contexts.GohanContext)
+	cfg := gc.Config
+	es := gc.Es7Client
 
 	// accumulate number of variants associated with each
 	// sampleId fetched from the variants overview
 	resultsMap, err := variantService.GetVariantsOverview(es, cfg)
 
+	fmt.Printf("resultsMapDDD: %v\n", resultsMap)
+
 	if err != nil {
 		// Could not talk to Elasticsearch, return an error
 		return c.JSON(http.StatusInternalServerError, map[string]interface{}{
@@ -36,6 +40,13 @@ func GetDataTypes(c echo.Context) error {
 
 	variantDataTypeJson["count"] = sumAllValues(resultsMap["sampleIDs"])
 
+	// Fetch the last_created value from resultsMap and add to variantDataTypeJson
+	if latestCreated, ok := resultsMap["last_created_time"].(string); ok {
+		variantDataTypeJson["last_created"] = latestCreated
+	}
+
+	fmt.Printf("variantDataTypeJson: %v\n", variantDataTypeJson)
+
 	// Data types are basically stand-ins for schema blocks
 	return c.JSON(http.StatusOK, []map[string]interface{}{
 		variantDataTypeJson,
diff --git a/src/api/mvc/variants/main.go b/src/api/mvc/variants/main.go
index 08b9596..738191c 100644
--- a/src/api/mvc/variants/main.go
+++ b/src/api/mvc/variants/main.go
@@ -506,6 +506,10 @@ func GetLastCreatedVariantForDataset(c echo.Context) string {
 
 	g.Go(func() error {
 		timestamp, timestampError := esRepo.GetMostRecentVariantTimestamp(cfg, es, dataset.String())
+		fmt.Printf("timestamp: %v\n", timestamp)
+		fmt.Printf("timestampError: %v\n", timestampError)
+		fmt.Printf("timestampError == nil: %v\n", es)
+		fmt.Printf("timestampError == nil: %v\n", dataset.String())
 		if timestampError != nil {
 			fmt.Printf("Failed to fetch the most recent 'created' timestamp for dataset %s. Error: %v\n", dataset, timestampError)
 			return timestampError
diff --git a/src/api/repositories/elasticsearch/variants.go b/src/api/repositories/elasticsearch/variants.go
index 0cb65e8..661d7da 100644
--- a/src/api/repositories/elasticsearch/variants.go
+++ b/src/api/repositories/elasticsearch/variants.go
@@ -589,6 +589,7 @@ func CountDocumentsContainerVariantOrSampleIdInPositionRange(cfg *models.Config,
 
 func GetVariantsBucketsByKeyword(cfg *models.Config, es *elasticsearch.Client, keyword string) (map[string]interface{}, error) {
 	// begin building the request body.
+	fmt.Printf("Query StartKEYWORD: %s\n", keyword)
 	var buf bytes.Buffer
 	aggMap := map[string]interface{}{
 		"size": "0",
@@ -602,6 +603,12 @@ func GetVariantsBucketsByKeyword(cfg *models.Config, es *elasticsearch.Client, k
 					},
 				},
 			},
+			"latest_created": map[string]interface{}{
+				"max": map[string]interface{}{
+					"field":  "createdTime",
+					"format": "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
+				},
+			},
 		},
 	}
 
diff --git a/src/api/services/variants/main.go b/src/api/services/variants/main.go
index 68d0c92..f63f631 100644
--- a/src/api/services/variants/main.go
+++ b/src/api/services/variants/main.go
@@ -33,6 +33,7 @@ func GetVariantsOverview(es *elasticsearch.Client, cfg *models.Config) (map[stri
 		defer _wg.Done()
 
 		results, bucketsError := esRepo.GetVariantsBucketsByKeyword(cfg, es, keyword)
+		fmt.Printf("resultsCFCFCF: %v\n", results)
 		if bucketsError != nil {
 			resultsMux.Lock()
 			defer resultsMux.Unlock()
@@ -45,14 +46,17 @@ func GetVariantsOverview(es *elasticsearch.Client, cfg *models.Config) (map[stri
 
 		// retrieve aggregations.items.buckets
 		bucketsMapped := []interface{}{}
-		if aggs, aggsOk := results["aggregations"]; aggsOk {
-			aggsMapped := aggs.(map[string]interface{})
-
-			if items, itemsOk := aggsMapped["items"]; itemsOk {
-				itemsMapped := items.(map[string]interface{})
-
-				if buckets, bucketsOk := itemsMapped["buckets"]; bucketsOk {
-					bucketsMapped = buckets.([]interface{})
+		if aggs, aggsOk := results["aggregations"].(map[string]interface{}); aggsOk {
+			if latest, latestOk := aggs["latest_created"].(map[string]interface{}); latestOk {
+				if valueAsString, valOk := latest["value_as_string"].(string); valOk {
+					resultsMux.Lock()
+					resultsMap["last_created_time"] = valueAsString
+					resultsMux.Unlock()
+				}
+			}
+			if items, itemsOk := aggs["items"].(map[string]interface{}); itemsOk {
+				if buckets, bucketsOk := items["buckets"].([]interface{}); bucketsOk {
+					bucketsMapped = buckets
 				}
 			}
 		}
@@ -77,6 +81,12 @@ func GetVariantsOverview(es *elasticsearch.Client, cfg *models.Config) (map[stri
 		return nil, errors.New("could not contact Elasticsearch - make sure it's running")
 	}
 
+	// Extract latest created time
+	if latest, exists := resultsMap["last_created"].(map[string]interface{}); exists {
+		latestCreatedTime := latest["value_as_string"].(string)
+		resultsMap["last_created_time"] = latestCreatedTime
+	}
+
 	// get distribution of chromosomes
 	wg.Add(1)
 	go callGetBucketsByKeyword("chromosomes", "chrom.keyword", &wg)